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Karyology Of Lower Teleost Fishes (Clupeiformes, Taxonomy, Elopiformes, Phylogeny)., Albert John Doucette Jr
Karyology Of Lower Teleost Fishes (Clupeiformes, Taxonomy, Elopiformes, Phylogeny)., Albert John Doucette Jr
LSU Historical Dissertations and Theses
Karyotypes of nine species (Megalops atlanticus, Elops saurus, Brevoortia patronus, B. smithi, B. tyrannus, Dorosoma cepedianum, D. petenense, Harengula clupeola, and Anchoa mitchilli) and one hybrid (B. smithi x B. tyrannus) of teleost fishes revealed diploid complements ranging from 28 to 50 chromosomes and comprised of uniarmed elements or combinations of uniarmed and small and large biarmed elements. The occurance of large metacentric-submetacentric chromosomes was usually associated with a reduction in total chromosome number suggesting fusion events in the evolution of karyotypes from ancestral complements with 48 to 52 acrocentrics. Information from karyotypes is used to characterize species, genera, and …
Biochemical Systematics Of The Tyrannoidea (Aves) (Electrophoresis, Jackknifing, Phylogenetic Trees, Consensus Methods)., Scott Merrill Lanyon
Biochemical Systematics Of The Tyrannoidea (Aves) (Electrophoresis, Jackknifing, Phylogenetic Trees, Consensus Methods)., Scott Merrill Lanyon
LSU Historical Dissertations and Theses
The superfamily Tyrannoidea (Aves) has been the subject of numerous systematic investigations, yet the relationships among and within the five component families remain ambiguous. Relationships within the superfamily were investigated using starch gel electrophoresis of 20 enzyme loci in 14 cotinga genera, 12 manakin genera, the flycatcher genus Myiarchus, and each of the genera from the monogeneric families Phytotomidae and Dxyruncidae. Electrophoretic characters were found to contain considerable information concerning familial and subfamilial relationships within this New World assemblage. The Fitch-Margoliash "jackknife strict consensus tree" and a cladogram generated from the character state distributions were very similar and were used …
Molecular Studies Of Thamnophiine Snakes., Robin Lawson
Molecular Studies Of Thamnophiine Snakes., Robin Lawson
LSU Historical Dissertations and Theses
Variation in alleles at gene loci encoding proteins was used to determine zoogeographic and evolutionary differentiation in thamnophiine snakes. Differentiation among populations within a species, among species within a genus, and among genera was investigated. In the southern banded water snake, Nerodia fasciata, analysis by F-statistics and genetic distances of allele frequencies indicated that extensive differentiation has occurred between those forms adapted to a saltwater environment (N. f. clarkii and N. f. compressicauda) and those adapted to a freshwater environment (N. f. fasciata, N. f. confluens, and N. f. pictiventris). Habitat disturbance is imputed as the causal agent in the …